Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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what is soil composed of? water, air, minerals, and organic matter. wat…
water, air, minerals, and organic matter.
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which of the following consist of organic matter only? earthworms, sand…
compost, lady bug, microorganisms
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match the terms with their corresponding definitions. epic poem ? a lon…
Epic poem - A long poem about a hero whose actions affect and reflect an entire nation. Style - A notable quality in the way a person expresses something. Lyric poem - A short poe…
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1. how many grams of na₂s are in 4.75 moles? how many atoms are there? …
The mass of \(Na_2S\) is \(371\ g\) and the number of atoms is \(8.58\times 10^{24}\) atoms.
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3. what is the mass of 5.34×10²⁰ particles of c₂h₆?
\(0.0267\ g\)
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consider the reaction of zinc metal with hydrochloric acid, hcl(aq). zn…
D. 16.5 moles
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chloroform, $chcl_3$, reacts with chlorine, $cl_2$, to form carbon tetr…
B. $\mathrm{CHCl_3}$
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for the following equation. 2mg(s) + o₂(g) → 2mgo(s) the number of mole…
A. \(2.00\space mol\)
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for the following equation. 2mg(s) + o₂(g) → 2mgo(s) how many grams of …
D. 101 g
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if the theoretical yield of the reaction below corresponds to 99.2 g an…
A. 61.4%
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summarize it! drag and drop the words or phrases that accurately comple…
The first blank: created. The second blank: transformed. The third blank: potential. The fourth blank: motion.
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question 2. is the following sentence true or false? the group number o…
True # Question 3
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what element has the configuration 1s²2s²2p⁶3s²3p⁴
The element with atomic number \(16\) is sulfur (\(S\)).
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what element has the configuration 1s²2s²2p²
Carbon (\(C\))
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is the correct way to write the abbreviated electron configuration for …
\([Ar]3d^{10}4s^{2}4p^{5}\)
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what element has the configuration 1s²2s²2p⁶3s²3p⁶
The element with atomic number \(18\) is Argon (\(Ar\)).
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what element has the configuration 1s²2s²2p⁶
Neon (\(Ne\))
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what element has the configuration 1s²2s²2p⁶3s²3p³
Phosphorus (\(P\))
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what element has the configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2…
Iron (\(Fe\))
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our ability to understand chemistry at all is a direct result of the __…
models
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what element has the configuration 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p³ br sc se as
As
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multiple - choice question how many electrons are shared in a double bo…
4 (2 pairs)
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carbon has ______ valence electrons, while each oxygen has ____. 6, 4 1…
4, 6 (the third option)
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the lines represent a sharing of electrons, which is also called a meta…
C. a covalent bond
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what kind of bond is it when an electron is fully transferred to anothe…
Ionic
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the air in earths atmosphere is made up of molecules of gases like nitr…
C. As air gets warmer, it becomes less dense.
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multiple - choice question select the atom which does not require 8 ele…
Helium
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only after the discovery of ______ in the 1890s, could scientists begin…
electrons
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drag the missing word into place air is made of molecules. when air is …
dense
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where does wind come from? air is made up of molecules. when air is coo…
A. rises
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question 19 (1 point) write the chemical formula for each covalent comp…
Tetraphosphorus decoxide: \(P_4O_{10}\) Xenon tetrafluoride: \(XeF_4\)
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question 18 (1 point) name the following covalent compounds n₂o₄
Dinitrogen tetroxide
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question 17 (1 point) name the following covalent compounds c₃h₈
Propane
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question 17 (1 point) name the following covalent compounds c₃h₈ questi…
Propane; Dinitrogen tetroxide
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question 15 (1 point) write the chemical formula for each ternary ionic…
- Lithium chromate: \(Li_2CrO_4\) - Cobalt (II) nitrate: \(Co(NO_3)_2\)
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question 13 (1 point) name the following ternary ionic compound na₃po₄ …
1. Sodium phosphate 2. Barium acetate
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question 11 (1 point) write the name of each chemical formula gaf₃ ques…
Question 11: gallium fluoride Question 12: cadmium sulfide
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question 9 (1 point) write the name of each chemical formula bin questi…
bismuth nitride tin(IV) oxide
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question 7 (1 point) write the chemical formula for each ionic compound…
Question 7: \(HgCl_{2}\) Question 8: \(CuSe\)
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question 5 (1 point) write the chemical formula for each ionic compound…
Question 5: \(TlBr_{3}\) Question 6: \(Hg_{2}O\)
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question 3 (1 point) write the chemical symbol for the following: thall…
Question 3: \(Tl^{3+}\) Question 4: \(K^{+}\)
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question 1 (1 point) name the ion po^{-2} question 2 (1 point) name the…
1. Polonide ion 2. Lead(II) ion
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use the text to answer each question below. 1. world war i (wwi) took p…
1. D. “More than 9 million soldiers were killed, and 21 million were hurt.” 2. C. the fighting between them will stop for some time.
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4. propane is a commonly used barbeque fuel. determine the efficiency o…
The efficiency of the barbeque is approximately \(31.1\%\)
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2. lead adopts the face - centered cubit unit cell in its crystal struc…
The atomic radius of Lead is approximately \(175\space pm\)
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1. calcium crystallizes through cubic closest - packing. if the atomic …
The density of solid calcium is approximately \(1.55\space g/cm^{3}\)
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3. make a prediction. which salt can be used to electroplate the iron s…
The salt that can be used depends on the metal we want to plate the iron spoon with. If plating with copper, \(CuSO_4\) is used. Evidence: In electroplating, the metal ions in the…
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ccc matter and energy explain how you would expect the strength of the …
The ionic bonds in \(LiBr\) are stronger than those in \(KBr\). This is because \(Li^+\) is smaller than \(K^+\). According to Coulomb's law (\(F = k\frac{q_1q_2}{r^{2}}\)), with …
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sep construct an explanation why is a crystal of strontium chloride (sr…
A crystal of \(SrCl_2\) is an extended structure because it consists of \(Sr^{2+}\) and \(Cl^-\) ions arranged in a repeating three - dimensional pattern (no discrete molecules; c…
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exit ticket questions in terms of both electrons and metals/nonmetals e…
- **Electrons**: Ionic compounds: electron transfer. Covalent compounds: electron sharing. - **Metals/non - metals**: Ionic compounds: metal + non - metal. Covalent compounds: non…
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the half - life of palladium - 100 is 4 days. after 24 days a sample of…
Initial mass: \(448\) mg Mass after 8 weeks: \(\frac{7}{256}\approx0.02734375\) mg
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what mass (in grams) of aspirin (c9h8o4) is produced from 72.0 g of c7h…
\(89.2\space g\)
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when copper is heated with an excess of sulfur, copper(i) sulfide is fo…
The percent yield is approximately \(21.8\%\)
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one of the commercial uses of sulfuric acid is in the production of cal…
The percent yield is approximately $91.0\%$
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one of the commercial uses of sulfuric acid is the production of calciu…
The percent yield is approximately $57.9\%$
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if 38.5 g of no and 26.9 g of o₂ react together, what is the mass, in g…
\(59.0\space g\)
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if 2.05 mol of h₂ and 1.55 mol of o₂ react, how many moles of h₂o can b…
\(2.05\space mol\)
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question 10 of 10 sodium (na) has 11 protons and 12 neutrons. what is i…
C. Na - 23
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what is the mass in grams of co₂ that can be produced from the combusti…
\(857.12\space g\)
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question 9 of 10 how is the name of each element in the periodic table …
C. One or two letters are used to represent the name of each element.
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4. which chemical equation occurred in a closed system? a. lioh + co₂ →…
B. \(2LiOH + CO_{2}\to Li_{2}CO_{3}+H_{2}O\)
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question 8 of 10 what is the mass number most similar to? a. the averag…
C. The average mass of all isotopes of the element
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question 7 of 10 an atom of boron (b) has 5 protons and 6 neutrons. wha…
C. 11
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3. what coefficients are required to balance this equation? ____ fe₂o₃ …
B. 1, 3
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milk of magnesia, an aqueous suspension of magnesium hydroxide, is used…
\(7.41\times 10^{23}\) molecules of \(HCl\)
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question 6 of 10 potassium (k) has an atomic number of 19. it often for…
C. 18
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how many molecules of so₃ can be formed from 0.46 mol of o₂ (assuming e…
\(5.54\times 10^{23}\) molecules of \(SO_{3}\)
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question 4 of 10 how is hydrogen in heavy water different from hydrogen…
A. The hydrogen atoms in heavy water have a neutron in the nucleus, doubling the mass.
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what quantity, in moles, of hno₃ will be produced from the reaction of …
\(0.268\space mol\)
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question 3 of 10 what does the arrangement of the periodic table help s…
A. Patterns in the elements' properties
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what quantity, in moles, of al are necessary to form 69.2 g of albr₃ fr…
\(0.26\ mol\)
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question 2 of 10 what does the number above the symbol represent? a. th…
C. The atomic number
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what charge would an ion have if it had more electrons than protons? a.…
C. It would have a net negative charge.
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question 8 of 10 which of the following ideas did john dalton teach? a.…
A. That matter was made of indivisible particles
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what did the early atomic theory accomplish? a. it proved that the atom…
D. It started scientific thought about the structure of the atom.
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select the correct text in the passage which two sentences contain exam…
"Jared ensures that his lab is always clean so he avoids costly accidents caused by spills and leakages." and "Jared never eats or drinks in the lab so that he won't accidently sw…
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question 2 of 10 how did thomsons experiment change daltons atomic mode…
A. Thomson discovered that the atom contained smaller particles called electrons.
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question 14 of 25 as you heat a piece of wood on a fire, the temperatur…
D. The molecules in the wood are vibrating faster.
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what are some things that would be evaluated under the criteria of craf…
Brushstrokes, cut edges, glue use, overall neatness
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gravimetric analysis of agno₃ purpose (lo): determine the concentration…
$$\text{AgNO}_{3(aq)}+\text{NaCl}_{(aq)}\to\text{AgCl}_{(s)}+\text{NaNO}_{3(aq)}$$
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question 2 of 25 you burn a log on a fire. you use the fire to warm you…
A. Chemical energy is transformed to light energy and heat energy.
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3. how many moles of cu(s) form when 3 moles of c(s) reacts with 4 mole…
8 moles of \(Cu_{(s)}\) are formed.
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3. how many moles of cu(s) form when 3 moles of c(s) reacts with 4 mole…
d. 12
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naming chemicals: nomenclature binary ionic compounds ionic bond: bond …
1. cation; anion 2. two; metal; non - metal 3. two; metal and non - metal; cation; anion; metal and non - metal 4. cation; metal; anion; non - metal; -ide
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60)the ratio of chlorine to zinc ions in the compound zinc chloride wou…
60) D. \(2:1\) 61) B. \(Pb\) 62) A. \(3\) 63) E. \(CsF\)
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use the table of electronegativities, above, to determine which type of…
| Atom 1 | Atom 2 | Electronegativity Difference Value | Bond Type | | ---- | ---- | ---- | ---- | | Phosphorus | Silicon | $0.3$ | Polar | | Cobalt | Bromine | $1.1$ | Polar | | …
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read the text. air pressure is the pressure in a given area caused by t…
Altitude is lower, such as at sea level. → Air pressure is higher. Altitude is higher, such as at the top of Mount Everest. → Air pressure is lower.
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read the text. you have probably heard of the ph scale, which measures …
Hydronium ions form in the solution. → The solution becomes more acidic. Hydroxide ions form in the solution. → The solution becomes more basic.
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use the text to compare and contrast natural vanilla and artificial van…
- Comes from the vanilla bean: Natural vanilla (checked) - Has many health benefits: Natural vanilla (checked) - Is used in baked goods: Natural vanilla (checked), Artificial vani…
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multiple-choice question when was one of the first versions of the peri…
Around 1870
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multiple - choice question true or false: mendeleev was the first perso…
False
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multiple - choice question mendeleev created a simple list of elements.…
False
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who created the periodic table? john dalton albert einstein dimitri men…
Dimitri Mendeleev
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who is the main person responsible for creating the periodic table of e…
Mendeleev.
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what evidence did thomson have to support his hypothesis? (check all th…
- No matter what metal used for the disk, the particles produced were identical. - The particles had about 1/2000 the mass of a hydrogen atom, the lightest atom.
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4. an atom has two bonds. the bond lengths are measured in angstroms (a…
The \(1.5\ \mathring{A}\) bond is the single bond and the \(1.2\ \mathring{A}\) bond is the triple bond.
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3. the combustion of methanol is shown by the following equation: 2 ch₃…
The enthalpy change of the reaction is \(-478\ kJ\) and the molar heat of combustion of methanol is \(-239\ kJ/mol\)
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3. hydrogen is a strange atom. while it has just one electron in its va…
Hydrogen forms covalent bonds rather than ionic bonds because losing its only electron (to form \(H^+\)) makes it a highly unstable bare proton, and gaining an electron (to form \…
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2. what is the enthalpy change when 83.5 g of methane combusts? i can d…
The enthalpy change is approximately $-4637\ kJ$.
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8. which type of bonds hold two or more water molecules together, as sh…
C. hydrogen bonds